Rotating tool for working in earth, rock, metal, wood, and the like



o. RoLFsEN Aug; 19,-1930.

IROTATING ToL FOR WORKING 1N EARTH, ROCK, METAL, won, AND THE LIKE Filed Dec. 17, 1925 Patented Aug. 19, 1930 UNITED STATES OLE ROLFSEN, F LARVIK, NORWAY ROTATING 'rooL Fon WORKING In EARTH, ROCK, METAL, woon, AND THE 1.11ml

Application. filed December 17, 1925, serial No. 75,986, and'k ni nc'rway December '23, 1924.

The present invention has for its object the provision of a tool for working in earth, rock, metal, wood and the like, comprising a number of hammer heads mounted with a certain amount of loose play on pins interconnecting two disc shaped members mounted on a rotating shaft in suoli a manner that parts f A'of the hammer heads extend beyond the periphery of the said members.

The hammer heads preferably are given a polygonal form, for instance a triangular form, and are mounted on their pins by means of holes, having approximately the same polygonal form, so that each hammer head is adapted to take up a definite number f of positions with regard to the disc members.

ln accordance with the invention the basic construction explained above is combined with the principal feature that the hammer v head pins are guided in slots in the disc members, so as to be capable of yielding in a direction towards the rotating shaft. Preferably, this is accomplished by guiding the pinsA yin radial slots and pressing them outwards therein bymeans of springs.

ln order that a better understanding of the invention maybe obtained reference is made to the accompanying drawings which illustrate several forms of the invention.

Figs. 1 and 2 are a cross section and a longitudinal section, respectively, of a basic construction in accordance with the invention.

Fig. 3l is a side view of a modified form of the invention showing a number of the parts broken away. v

Fig. 4 is a sectional view on the line y IV-IV of Fig. 3.

Fig. 5 is a sectional view showing a further f modification of the invention.

, At first, the basic construction shown in Figs. 1 and 2 will be explained. lTwo disc members l are mounted on a rotating shaft f 2 and interconnected by pins 3. At a certain 'distance from the periphery of the members 1, there. are mounted triangular hammer heads 4, which are in engagement with the pins 3 by means of triangular holes 5 so dimensioned as to allow the hammer heads a certain amount of loose play.

-well known, keys 14 may be usedvto radially 'inwardl i The distance fromk pin-s3l tol the vshaft 2 must be suiiiciently great to allow free rotation of the hammer heads 4 about pins 3 in any' position.- yAccording tothe present invention, the pins 3 areto be allowed to yield in a` direction towards the rotating shafty 2,

'preferably radially. This be obtained in variouswaysbut I prefer the construction illustrated on Figs. 3' and 4, wherein thepins 3 yare mounted in two rings'l() in suchA a inanner that they can4 yield radially. The vinterior circumference lof each lofthe rings 10 is provided with radial slots 11 (Fig. 3) into which the pinsgS are yieldingly pressed by means" of circular or curved springs 6,V and .ins'ide'thesev springs- 6 `there are arranged polygonal discs 9, the corners of which press the springs against the Yinterior kcircumference of the rings 10`at pointsintermediate lthe pins 3. 'In their assembled form', the

parts 9 and 10 constitute the equivalent of the disc members 1 and in effect vmay be considered as discs. The term discVwhen'hereinafter used accordingly isto be interpreted as applying to the combination of the parts -9 and 10. l

` LQThefrings 10 are interconnected and .fas-

ten-ed to shaft 2 by means'ofouter plates, 'a dista-nce piece 12 and four u boltsl 8 passing through plates 7,`ringsl0 anddi'stance sleeves 13, whereby the rings 10V are Lfix'edly held a Vpro'perdistance apartto allow the hammers 4 to swing freely upon ,their pins. As is provide p a secure mounting fon the shaft. f i The springs iserve the purpose of `yieldinglyV retainingthe pins 3 wholly withinthe slots 1l at` all times when the `operation of the structure does not causethe pins tomove Fig.- 5 Ashows v a lmodification,`wherein the singlesetA of'hammers 4 shown inFigure'4 has been manifolded, a series of hammer sets being arranged side by side upon the same shaft 2 and held safely and steadily'apart by distance sleeves 12 between successive discs 9 and sleeves 13 between successive rings l0, the bolts 8 passing through all rings 10 and through the end plates?, 7.

When a large number of hammers are used,

as in Fig. 5, it is necessary to mount only one pair of diametrically opposed hammers 4; between each set of two rings 10, the pairs being angularly displaced by 90 between ad- 5 jacent sets of rings. As shown in Fig. 5, the hammers ldesignated as 41 are displaced 90 from those designated as 4.

Claims zl. A rotating tool for working in earth, rock, metal, wood and the like, comprising two parallel discs mounted on a rotating shaft in combination with a number of hammer heads, rotatably mounted withl loose play on pins, interconnecting the said two discs near the circumference thereof, said pins being guided in radial slots in said discs, saidy discs including a spring arranged to press said pins outwardly.

2. A rotating tool for working in earth,

20 rock, metal, wood and the like, comprising two parallel discs mounted on a rotating shaft in combination with a number of hammer heads, rotatably `mounted with loose play on pins, interconnecting the' said two discs near the circumference thereof, said pins being guided in slots in 'said discs, so as to be capable ofyielding in la direction towards the vrotating shaft. v Y

3. A rotating tool for working in earth,

ga rock, metal, wood and the like, comprising two parallel discs mounted on a rotating shaft in combination with a number of hammer heads, each with a polygonal outline and with a correspondingly shaped central aperture, said hammer heads being each rotatably I'nounted with loose play on ka pin passing through said aperture and interconnect-ing the said two discs near the circumference thereof, said pins being guided in radial slots 4o near the circumference thereof. Y

4; A rotating tool for working in earth, rock met-al, wood and the like, comprising two parallel discs mounted on a rotating lshaft in combination with a number of hamr mer heads, each with a polygonal outline and with a correspondingly shaped central aperture, said hammer heads being each rotatably mounted with loose play on a pin passing through said aperture and interconao necting the said two discs near the circumference thereof, said pins being guided in radial slots near theV circumference thereof, said 1discs including a spring arranged to press said pins outwardly. E i ln testimony that I claim the foregoing as Vmy inventiolnl have signed my name.

OLE ROLFSEN. 

